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P0102



DTC P0102

DTC DESCRIPTOR

DTC P0102
Mass Air Flow (MAF) Sensor Circuit Low Frequency

DTC P0103
Mass Air Flow (MAF) Sensor Circuit High Frequency

DIAGNOSTIC FAULT INFORMATION

IMPORTANT: Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Testing and Inspection






CIRCUIT/SYSTEM DESCRIPTION
The mass air flow (MAF) sensor is an air flow meter that measures the amount of air entering the engine. The control module uses the MAF sensor signal to provide the correct fuel delivery for all engine speeds and loads. A small quantity of air entering the engine indicates a deceleration or idle condition. A large quantity of air entering the engine indicates an acceleration or high load condition. The MAF sensor has the following circuits:
- An ignition 1 voltage circuit
- A ground circuit
- A signal circuit

The control module applies a voltage to the sensor on the signal circuit. The sensor uses the voltage to produce a frequency based on the inlet air flow through the sensor bore. The frequency varies within a range of near 2,000 Hertz at idle to near 10,000 Hertz at maximum engine load.

CONDITIONS FOR RUNNING THE DTC
- The engine is cranking or running.
- The engine speed is more than 50 RPM.
- The ignition 1 signal is more than 8 volts.
- The throttle position (TP) indicated angle parameter is more than 3.5 percent.
- The above conditions are met for more than 0.5 second.

CONDITIONS FOR SETTING THE DTC

P0102
The control module detects that the MAF sensor frequency signal is less than 1,200 Hertz for more than 10 seconds.

P0103
The control module detects that the MAF sensor frequency signal is more than 11,500 Hertz for more than 10 seconds.

ACTION TAKEN WHEN THE DTC SETS
- The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
- The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

CONDITIONS FOR CLEARING THE MIL/DTC
- The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
- A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
- A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
- Clear the MIL and the DTC with a scan tool.

DIAGNOSTIC AIDS
- Inspect the harness of the MAF sensor to verify that it is not routed too close to the following components:
- The secondary ignition wires or coils
- Any solenoids
- Any relays
- Any motors
- A wide open throttle (WOT) acceleration from a stop should cause the MAF sensor parameter on the scan tool to increase rapidly. This increase should be from 3-10 g/s at idle to 150 g/s or more at the time of the 1-2 shift. If the increase is not observed, inspect for a restriction in the induction system or the exhaust system.
- A high resistance may cause a driveability concern before this DTC sets.

CIRCUIT/SYSTEM TESTING
1. Inspect for any contamination, water intrusion, or debris on the sensing elements of the MAF sensor.
- If debris is present, clean the sensor. If the sensor cannot be cleaned, replace the sensor.
2. Inspect the fuse in the ignition 1 voltage circuit of the MAF sensor.
- If the fuse is open, test the ignition 1 voltage circuit for a short to ground.
3. Turn OFF the ignition. Disconnect the MAF/intake air temperature (IAT) sensor. Start the engine.
4. Observe the MAF/IAT sensor with a scan tool for 0 Hz.
- If more than 0 Hz, turn OFF the ignition and inspect the harness for improper routing that is too close to any aftermarket accessories, secondary ignition wires, coils, solenoids, relays, or motors.
5. Turn ON the ignition, with the engine OFF.
6. Measure the battery voltage with a DMM.
7. Disconnect the MAF/IAT sensor.
8. Connect a test lamp between the ignition 1 voltage circuit of the MAF sensor and a good ground.
9. Connect the DMM to the probe of the test lamp and good ground, and measure for battery voltage.
- If not within 0.5 volt of battery voltage, repair the high resistance or open in the MAF sensor ignition 1 voltage circuit.
10. Turn OFF the ignition and all accessories for 60 seconds to allow the control module to power down.
11. Measure for 5 ohms of resistance from the ground circuit of the MAF sensor to a good ground with a DMM.
- If the resistance is more than 5 ohms, repair the high resistance or the open in the MAF sensor ground circuit.
12. Turn ON the ignition, with the engine OFF.
13. Measure for 4.8-5.2 volts from the signal circuit of the MAF sensor to a good ground with a DMM.
- If more than 5.2 volts, test the circuit for a short to voltage, or faulty control module.
- If less than 4.8 volts, test the circuit for an open, short to ground, or a faulty control module.
14. Turn OFF the ignition and connect the J 38522 to the signal circuit at the MAF sensor and a good ground.
15. To set up the variable speed generator, use the switches to set the duty cycle to normal, the frequency to 5 K, and the signal switch to 5 volts.
16. Start the engine and observe the MAF sensor parameter for 4,950-5,025 Hz with a scan tool.
- If the MAF sensor is not within the specified parameter range, test for intermittent or poor connection at the control module. If tests OK, replace the control module.
- If the MAF sensor is within the specified parameter range, test for intermittent or poor connection at the MAF sensor. If tests OK, replace the MAF sensor.

REPAIR INSTRUCTIONS

IMPORTANT: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure.
- Mass Air Flow (MAF)/Intake Air Temperature (IAT) Sensor Replacement
- Control Module References for control module replacement, setup, and programming. Verification Tests
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